| Zip Code | Primary City | Secondary City | | 12180 | Troy | Troy, Albia, Brunswick, Center Brunswick, Eagle Mills, Raymertown, Snyders Corners, Snyders Lake, Speigletown, Sycaway | | 12181 | Troy | | | 12182 | Troy | Troy, Lansingburg, Pleasantdale, Speigletown | | 12183 | Troy | Green Island |
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